Initial inorbit verification of OICETS optical terminals functions

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Initial in-orbit verification of OICETS optical
terminals functions
Yoshihisa Takayama 1, Takashi Jono 1, Nobuhiro
Kura 1, Koichi Ohinata 1, Yoshisada Koyama 1,
Koichi Shiratama 2, Junya Abe 3, Masaaki Mokuno
1, Katsuyoshi Arai 1 1 Japan Aerospace
Exploration Agency, 2 NEC TOSHIBA Space
Systems.Ltd, 3 Space Engineering Development Co.
Ltd,
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• Schedule of OICETS experiments
• Satellite operation system
• Major Characteristics of OICETS
• Major characteristics of LUCE
• Scenario of functional verification
• Results of functional verification

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2005
Sep.
Oct.
Nov.
Dec.
Aug.
Launch 23th
Interrupted (Solar flare)
Opt. check out
Opt. check out
Laser Comm. (Commissioning phase)
S-band check out
Thruster unloading
SSA comm.
Success in communications with ARTEMIS. 9th Dec.
2006
Feb.
Mar.
Apr.
Jan.
Laser Comm. (Experiment phase) Improvement in
comm. quality
Laser Comm. (Routine phase) Repeat of comm.
OICETS-Ground Station comm.
Preparations for OICETS-Ground Station comm.
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Satellite operation system
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Major characteristics of OICETS
Optical Inter-orbit Communications Engineering
Test Satellite (OICETS)
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Major characteristics of LUCE
Laser Utilizing Communication Equipment (LUCE)
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Scenario of functional verification
Launch
23 Aug.
2005
27 Aug.
1 Sep.
Interrupted by solar-flare(9 Sep. 20 Sep.)
22 Sep.
Devices Alignment check with a inner light source
Optical sensors (CCD, QD, APD)
Gimbals moving accuracy
Bit error counts
27 Sep.
Stray light in optics
28 Sep.
Open-loop pointing
Open and closed-loop operations Alignment check
with outer light sources
Acquisition and tracking sequences
Point ahead mechanisms operation
Alignment of optical axis
10 Oct.
11 Oct.
Automatic sequences
29 Nov.
In-orbit communications with ARTEMIS
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Requirement for precise angular control
40000 km
5 mrad
7 km/s
Point ahead
50 mrad
Criteria for functional verification
CP pointing error lt 0.2 deg. FP tracking error lt
1 mrad Acquisition time lt 360msec
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Acquisition and Tracking of Mars
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Results of functional verification
Criteria for functional verification
CP pointing error lt 0.2 deg. FP tracking error lt
1 mrad Acquisition time lt 360msec
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Conclusions
Results of the initial verifications of laser
communication functions was introduced.

• Schedule of OICETS experiments
• Satellite operation system
• Major Characteristics of OICETS
• Major characteristics of LUCE
• Scenario of functional verification
• Results of functional verification

Careful verification of communication functions
contributed to the successful laser
communications with ARTEMIS